JP2019071695A - Control node, communication method, and terminal device - Google Patents

Abstract

Mobility management capable of normally notifying a UE of a voice call that occurs while an ISR is operating and a mobile communication device is moving from an MME to a location registration area under an SGSN Providing an apparatus A mobility management apparatus according to the present invention operates an ISR function in cooperation with an SGSN. A location registration area 60 managed by the mobility management device 10 exists in the location registration area 50 managed by the SGSN 20, and the mobile communication device 30 moves while moving from the second location registration area 60. Assume that an incoming voice call occurs for 30. In this case, the mobility management device 10 transmits a response message indicating that the mobile communication device 30 is moving to the exchange 40, and when the voice incoming message is retransmitted after a predetermined period from the exchange 40, the mobile communication device A voice incoming call control unit 11 that performs 30 calling processes is provided. [Selection] Figure 1

Description

  The present invention relates to a mobility management apparatus, a communication system, a voice incoming call control method and program, and more particularly to a mobility management apparatus using an ISR function, a communication system, a voice incoming call control method and program. Voice calls within the present invention also include multimedia communications such as video telephony.

  In 3GPP (Third Generation Partnership Project) defining standard technology of mobile network system, EPC (Evolved Packet Core) is defined as a next-generation mobile network system. The EPC is a network system that accommodates Long Term Evolution (LTE) access networks as well as radio access networks called second and third generation.

  Here, a state in which the mobile communication device located in the LTE wireless area is connected to the EPC is referred to as an ECM-CONNECTED state. The mobile communication device may be referred to as a mobile terminal device. Further, the mobile communication device is defined as UE (User Equipment) in 3GPP. Furthermore, an apparatus for managing the position of the UE located in the LTE radio area is an MME (Mobility Management Entity), and the position of the UE located in the second and third generation radio areas (hereinafter referred to as 3G radio area) The device that manages the is the SGSN (Serving GPRS Support Node).

  At the beginning of the introduction of the LTE radio area, it is assumed that the LTE radio area will be expanded gradually so as to overlap with the 3G radio area. When the LTE radio area and the 3G radio area overlap and the LTE radio area is small, the UE located at the end of the LTE radio area may frequently switch between the LTE radio area and the 3G radio area is assumed. Frequent switching between the LTE wireless area and the 3G wireless area causes problems such as an increase in network processing load due to the location registration process and battery consumption of the UE.

  Therefore, according to Non-Patent Document 1, unless there is a change from the previously registered location registration area in the LTE wireless area and the 3G wireless area, LTE / 3G location registration omitting location registration even when the UE moves to a different area It defines the omitted functions (ISR: Idle mode Signaling Reduction function, hereinafter referred to as ISR function). By operating the ISR, it is possible to reduce the number of times of location registration, thereby solving problems such as an increase in network processing load and battery consumption of the UE.

SAE basic control technology to realize All-IP network "NTT DOCOMO Technical Journal Vol. 17 No. 3" October 2009

  When a UE in the ECM-CONNECTED state is located in a location registration area under MME, and when a voice call arrives from the Mobile Switching Center (MSC) / Visitor Location Register (VLR) to the UE, the MSC / VLR Notifies the MME that an incoming voice has occurred to the UE. The MME notifies the MSC / VLR that it has accepted an incoming call to the UE. Furthermore, the MME notifies the UE that an incoming call has arrived. At this time, since the voice call notification is accepted, the MSC / VLR stops the timer for retransmission of the call notification and waits for a response from the UE. Here, when the MME transmits an incoming call notification to the UE during the process of moving from the MME to the location registration area under the control of the SGSN (handover), the incoming notification to the UE may not reach.

  At this time, if the movement destination of the UE is a position registration area under MME or an SGSN under an ISR is not activated, in the position registration area under an MME or an SGSN under an activation of the ISR, the voice call is received from the UE. Location registration is newly performed on the MSC / VLR. Therefore, the MSC / VLR can notify the voice arrival to the UE located in the location registration area under the SGSN under the state where the moving destination MME or ISR is not activated. On the other hand, when the movement destination of the UE is the location registration area under the SGSN under which ISR is activated, location registration is not performed from the UE. Therefore, if the incoming call notification did not reach the UE because the MME sent an incoming call notification to the UE during handover processing of the UE, the MSC / VLR is a UE that is located in the location registration area under the SGSN activating ISR. There is a problem that the voice call can not be notified again, and the voice call can not be received correctly to the UE.

  An object of the present invention is an ISR operating in an MME and an SGSN, wherein a voice incoming call generated while the mobile communication device is moving from the MME to a location registration area under the SGSN is normally transmitted to the UE. It is to notify.

  A mobility management apparatus according to a first aspect of the present invention is a mobility management apparatus for operating an ISR function in cooperation with an SGSN, wherein the mobility management apparatus manages the first location registration area managed by the SGSN. While the mobile communication device is moving from the second position registration area to the first position registration area outside the second position registration area. And, when an incoming voice call is generated to the mobile communication device, a response message indicating that the mobile communication device is moving is transmitted to the switch in response to the voice incoming message notified from the switch; And a voice incoming control unit that performs call processing of the mobile communication apparatus via the SGSN when the voice incoming message is retransmitted after a predetermined period of time has elapsed since the

  A communication system according to a second aspect of the present invention is a mobility management apparatus that manages an SGSN that manages a first location registration area, and a second location registration area that overlaps a part of the first location registration area. And a switch for notifying the mobile communication device of an incoming call via the mobility management device, wherein the mobile communication device is outside the second position registration area from the second position registration area, When an incoming call occurs to the mobile communication device while moving into the first location registration area, the mobility management device moves the mobile communication device in response to the incoming call message notified from the exchange. When a response message indicating that the communication apparatus is moving is sent to the exchange, and the voice incoming message is retransmitted after a predetermined period of time from the exchange, the transfer is performed via the SGSN. And it performs a call processing of the communication device.

  A voice call incoming control method according to a third aspect of the present invention is a voice incoming call control method executed in a mobility management apparatus that operates an ISR function in cooperation with an SGSN, the first location registration being managed by the SGSN. A second location registration area managed by the mobility management device exists in the area, and the mobile communication device is outside the second location registration area from the second location registration area and the first location registration When a voice call is received to the mobile communication device while moving into an area, a response message indicating that the mobile communication device is moving in response to a voice call incoming message notified from the exchange Is sent to the switch, and the call processing of the mobile communication device is performed via the SGSN when the voice incoming message is resent after a predetermined period of time has elapsed from the switch. It is intended.

  A program according to a fourth aspect of the present invention is a program that is executed by a computer of a mobility management apparatus that operates an ISR function in cooperation with an SGSN, wherein the migration is performed within a first location registration area managed by the SGSN. There is a second location registration area managed by the management device, and the mobile communication device moves from the second location registration area into the first location registration area outside the second location registration area. When a voice call is received to the mobile communication device during the transmission, a response message indicating that the mobile communication device is moving is sent to the switch in response to the voice call incoming message notified from the switch. And calling the mobile communication device via the SGSN when the voice incoming message is resent after a predetermined period of time has elapsed from the switch. It is intended to execute a step of performing management in computer.

  According to the present invention, in the case where an ISR is operating in MME and SGSN, a voice incoming call occurring while moving a mobile communication device from MME to a location registration area under SGSN under ECM-CONNECTED is normal The present invention can provide a mobility management device, a communication system, a voice call termination control method, and a program that can be notified to the UE.

FIG. 1 is a configuration diagram of a communication system according to a first embodiment. FIG. 7 is a configuration diagram of a communication system according to a second embodiment. FIG. 16 is a diagram showing a flow of connection processing of the UE to the network according to the second embodiment. FIG. 8 is a diagram showing a flow of voice call reception processing according to a second embodiment; FIG. 14 is a diagram showing a flow of voice call reception processing according to a third exemplary embodiment; FIG. 18 is a diagram showing a flow of voice call reception processing according to a fourth embodiment; FIG. 18 is a diagram showing a flow of voice call reception processing according to a fifth exemplary embodiment; FIG. 18 is a diagram showing a flow of voice call reception processing according to a fifth exemplary embodiment;

Embodiment 1
Hereinafter, embodiments of the present invention will be described with reference to the drawings. A configuration example of the communication system according to the first embodiment of the present invention will be described using FIG. The communication system of FIG. 1 is configured by a node device defined in 3GPP. The communication system of FIG. 1 includes a mobility management device 10, an SGSN 20, a mobile communication device 30, and a switch 40.

  The mobility management device 10 and the SGSN 20 cooperate with each other to operate the ISR function. Operating the ISR function means, in other words, the mobility management device 10 and the SGSN 20 activate the ISR function installed in each. The SGSN 20 manages a location registration area 50. The mobility management device 10 manages the location registration area 60. Location registration area 50 includes location registration area 60. That is, a partial area of the position registration area 50 and the position registration area 60 are overlapping areas.

  In FIG. 1, the mobile communication device 30 is moving from the position registration area 60 to the position registration area 50 outside the position registration area 60.

  The exchange 40 notifies the mobile communication device 30 of the incoming voice call to the mobile communication device 30 via the mobility management device 10. Here, when the mobile communication device 30 is located in the location registration area 60, the exchange 40 notifies the mobile communication device 30 of an incoming call via the mobility management device 10. When the mobile communication device 30 is located outside the location registration area 60 and in the location registration area 50, the exchange 40 notifies the mobile communication device 30 of an incoming voice call via the mobility management device 10 and the SGSN 20.

  Next, a configuration example of the mobility management device 10 will be described. The mobility management device 10 has a voice incoming call control unit 11. Here, the case where a voice incoming call occurs to the mobile communication device 30 while the mobile communication device 30 is moving from the position registration area 60 to outside the position registration area 60 and into the position registration area 50 will be described. In the middle of moving is a state in which movement processing of the mobile communication device 30 is not completed in the mobility management device 10 and the SGSN 20, for example, a state in which the handover processing of the mobile communication device 30 is not completed. .

  When the voice incoming call control unit 11 detects that the mobile communication device 30 has moved out of the location registration area 60 when the voice incoming message is notified from the exchange 40, it is assumed that the mobile communication device 30 is moving. A response message is sent to the exchange 40. For example, when the call reception control unit 11 performs call reception processing to the mobile communication device 30, the call reception notification message is transmitted from the base station that has managed the mobile communication device 30 to the mobile communication device 30. The mobile communication device 30 may detect that the mobile communication device 30 has moved out of the location registration area 60 when being notified that it has not been possible. Here, when the voice incoming call is not normally notified to the mobile communication apparatus 30 via the mobility management apparatus 10, the exchange 40 retransmits the voice incoming message after a predetermined period has elapsed.

  When the voice incoming message is resent from the switch 40 after a predetermined period of time, the voice incoming control unit 11 completes the handover to the outside of the location registration area 60 and into the location registration area 50, so that the SGSN 20 And sends a message instructing the mobile communication device 30 to call. That is, the mobility management device 10 performs call processing of the mobile communication device 30 via the SGSN 20.

  As described above, by using the communication system of FIG. 1, the ISR function is operating in the mobility management device 10 and the SGSN 20, and the mobile communication device 30 is out of the location registration area 60 and outside the location registration area 60 Even when the mobile communication device 30 receives a voice incoming call while moving into the registration area 50, the exchange 40 can notify the mobile communication device 30 of the voice incoming call.

  Generally, when the ISR function is operating in mobility management device 10 and SGSN 20, even when mobile communication device 30 moves from location registration area 60 to outside location registration area 60 and into location registration area 50. The position registration process of the mobile communication device 30 is not performed. For example, when an incoming voice call to the mobile communication device 30 occurs before the movement processing of the mobile communication device 30 is completed, that is, before the handover processing is completed, the mobility management device 10 moves the mobile communication device into the location registration area 60. When the mobile station 30 is located, the mobile communication device 30 is called. At this time, when the mobile management device 10 receives the voice incoming message notified from the exchange 40, the exchange 40 retransmits the voice incoming message to the mobile management device 10 in order to stop the retransmission timer of the voice incoming message. There is nothing to do. In such a case, the mobile communication device 30 does not perform location registration processing for the switch 40 because the ISR function is operating. Therefore, the exchange 40 can not obtain an opportunity to transmit an incoming call message to the mobile communication device 30 which has moved out of the location registration area 60 again.

  Therefore, when the mobility management device 10 fails in the calling process of the mobile communication device 30, the exchange 40 can not transmit the voice incoming notification message to the mobile communication device 30.

  On the other hand, by using the communication system of FIG. 1, the mobility management device 10 transmits the voice incoming message notified from the switch instead of transmitting a message indicating that the voice incoming message has been accepted. A response message indicating that the communication device 30 is moving is sent to the switch 40. By this, since it is possible to prevent the retransmission timer in the exchange 40 from being stopped, the mobility management device 10 receives the voice incoming message again after the retransmission timer in the exchange 40 has expired.

  When the mobile management device 10 receives the voice incoming message again, the handover processing of the mobile communication device 30 is completed by the elapse of a predetermined period, so the call processing to the mobile communication device 30 via the SGSN 20 is performed. It can be done. The retransmission timer of the voice incoming message in the exchange 40 may be determined in consideration of the execution time of the handover process of the mobile communication device 30. In this way, by using the communication system of FIG. 1, it is possible to reliably notify the mobile communication device 30 of the voice incoming message.

Second Embodiment
Subsequently, a configuration example of the communication system according to the second embodiment of the present invention will be described using FIG. The communication system of FIG. 2 includes an MME 15, an SGSN 20, a UE 35, an MSC / VLR 45, an eNB (evolved Node B) 70, and a 2G / 3G radio control apparatus 80. The MSC / VLR 45 is connected to the external network.

  The MME 15 corresponds to the mobility management device 10 of FIG. The MSC / VLR 45 corresponds to the switch 40 of FIG. The UE 35 corresponds to the mobile communication device 30 of FIG. The eNB 70 is a base station apparatus that manages an LTE wireless area. The 2G / 3G wireless control device 80 is a wireless control device that manages a 2G or 3G wireless area. The 2G / 3G radio control apparatus 80 may be, for example, an RNC (Radio Network Controller) defined in 3GPP.

  The UE 35 is a communication device defined as a mobile communication device in 3GPP. The UE 35 may be a mobile phone, a smartphone, a tablet terminal, a personal computer having a communication function, or the like. Furthermore, the UE 35 may be an M2M (Machine To Machine) device that communicates autonomously. The M2M device may be, for example, a vending machine having a communication function, an apparatus that moves less frequently, such as an electrical appliance, or the like, or may be a watch worn by a user.

  Subsequently, the flow of the process of connecting the UE 35 to the network will be described with reference to FIG. First, the UE 35 transmits a Combined Attach Request message to the MME 15 in order to make a circuit-coupled position registration request (S11). MME15 will produce | generate the location registration information of UE35, if a Combined Attach Request message is received. The location registration information includes, for example, information indicating that the UE 35 is in the location registration area managed by the MME 15 or subscriber information of the UE 35. The subscriber information of the UE 35 may be acquired from a subscriber information management device (not shown) disposed in the mobile communication system. The subscriber information management device is defined, for example, as a Home Subscriber Server (HSS) in 3GPP.

  Next, the MME 15 establishes SGs Association with the MSC / VLR 45 (S12). The SGs Association is used to transmit and receive a voice incoming message (CS (Call Switch) control signal) between the MME 15 and the MSC / VLR 45. When the MME 15 establishes the SGs Association with the MSC / VLR 45, the MME 15 sends a Combined Attach Accept message to the UE 35 (S13).

  Next, the UE 35 transmits a Routing Area Update Request message to the SGSN 20 (S14). Upon receiving the Routing Area Update Request message, the SGSN 20 generates location registration information of the UE 35.

  Next, location registration information is synchronized between the SGSN 20 and the MME 15, and the ISR is validated (S15). Next, the SGSN 20 transmits a Routing Area Update Accept message to the UE 35 (S16). After executing the processing of steps S11 to S16, the UE 35 and the MME 15 enter the ECM-CONNECTED state (S17). The ECM-CONNECTED state is a state in which a communication path for user data is established between the network and the UE 35.

  Subsequently, the flow of the voice incoming process to the UE 35 will be described using FIG. 4. In addition, in performing the process of FIG. 4, the process of FIG. 3 is already implemented and suppose that UE35 and MME15 are in an ECM-CONNECTED state.

  First, the MSC / VLR 45 receives an incoming voice message sent from the voice network (S21). Next, the MSC / VLR 45 transmits a Paging Request message to the MME 15 (S22). Here, when the Paging Request message is transmitted, the MSC / VLR 45 starts a retransmission timer that defines the retransmission timing of the Paging message (S23).

  Here, even when the MME 15 receives the Paging Request message, the MME 15 does not transmit, to the MSC / VLR 45, a response message (Service Request message) indicating that a voice call has been received. The MSC / VLR 45 stops the timer that has been activated to retransmit the voice incoming message (Paging Request message) when the voice incoming is accepted in the MME 15. Therefore, the MME 15 does not transmit a Service Request message to the MSC / VLR 45 in order to prevent the retransmission timer from stopping.

  Next, the MME 15 transmits a CS Service Notification message to notify the UE 35 of an incoming voice call via the eNB 70 (S24). Here, the UE 35 starts moving out of the location registration area 60 before the CS Service Notification message is transmitted from the eNB 70 (S25). In this case, the eNB 70 gives up transmission of the CS Service Notification message (S26) to the UE 35 because the UE 35 has already started moving out of the location registration area 60. In the following description, although the case where transmission of the CS Service Notification message (S26) is abandoned to the UE 35 is described, the eNB 70 transmits the CS Service Notification message to the UE 35, and then the UE 35 to the MME 15 When a response message (NAS Extended Service Request message) is sent, the MME 15 sends a Service Request message to the MSC / VLR 45 upon receiving the NAS Extended Service Request message.

  Next, the eNB 70 transmits, to the MME 15, a NAS Non Delivery Indication message indicating that the CS Service Notification message could not be transmitted to the UE 35 (S27). Next, when the MME 15 receives the NAS Non Delivery Indication message, the UE 35 has moved, and the Paging Reject message in which the Cause is set indicating that the CS Service Notification message could not be notified to the UE 35 is MSC / VLR 45 It transmits to (S28).

  Next, the eNB 70 transmits a Handover Required message to the MME 15 in order to start the handover process of the UE 35 (S29). The MME 15 performs handover processing with the SGSN 20 (S30). Next, when the registration process of the UE 35 is completed in the handover process, the SGSN 20 transmits a Forward Relocation Complete Notification message to the MME 15 (S31). Next, the MME 15 transmits a Forward Relocation Complete Acknowledge message as a response message to the Forward Relocation Complete Notification message to the SGSN 20 (S32). Thus, when the handover process of the UE 35 is completed, the UE 35 and the SGSN 20 enter the PMM-CONNECTED state. The PMM-CONNECTED state is a state in which a communication path for user data is established between the network and the UE 35.

  Next, when the retransmission timer of the Paging Request message expires, the MSC / VLR 45 retransmits the Paging Request message to the MME 15 (S35). Next, the MME 15 transmits a CS Paging Indication message instructing the SGSN 20 to perform a call process of the UE 35, since the UE 35 has already moved to the SGSN 20 (S36). Next, the SGSN 20 performs call processing of the UE 35 (S37).

  As described above, by performing the voice incoming process in FIG. 4, it is possible to prevent the stop of the retransmission timer in the MSC / VLR 45. By this, the MSC / VLR 45 can transmit the Paging Request message to the MME 15 again, so that it can notify the UE 35 of the voice incoming call after the handover process is completed.

Third Embodiment
Subsequently, the flow of the voice incoming process to the UE 35 according to the third embodiment of the present invention will be described using FIG. In addition, in performing the process of FIG. 5, the process of FIG. 3 is already implemented and suppose that UE35 and MME15 are in an ECM-CONNECTED state.

  First, the UE 35 starts moving out of the position registration area 60 and into the position registration area 50 (S41). Next, the eNB 70 transmits a Handover Required message to the MME 15 in order to start the handover process of the UE 35 (S42). In the EPC, that is, in the network, the Handover Required message is the first message of the handover process. Here, the MSC / VLR 45 receives a voice incoming message transmitted from the voice network (S43). Next, the MSC / VLR 45 transmits a Paging Request message to the MME 15 (S44). Here, when the Paging Request message is transmitted, the MSC / VLR 45 starts a retransmission timer that defines the retransmission timing of the Paging message (S45).

  5 differs from FIG. 4 in that the MME 15 receives the Paging Request message after receiving the Handover Required message. When the MME 15 receives the messages in such an order, the MME 15 does not execute the process associated with the reception of the Paging Request message. That is, in FIG. 5, the MME 15 does not execute the processes of steps S24 to S28 in FIG. 4. In other words, the MME 15 does not perform an operation of transmitting the CS Service Notification message, which is processing for receiving the Paging Request message, to the UE 35, and discards the Paging Request message. On the other hand, the MME 15 gives priority to the process associated with the reception of the Handover Required message, not the process associated with the reception of the Paging Request message.

  Steps S46 to S53 are the same as steps S30 to S37 in FIG. In this figure, MME15 does not transmit a CS Service Notification message to eNB70, when the Paging Request message first transmitted from MSC / VLR45 in step S44 is received. The MME 15 executes call processing of the UE 35 via the SGSN 20 when the Paging Request message is transmitted in step S51 with the expiration of the retransmission timer in the MSC / VLR 45.

  As described above, by executing the flow of the voice call reception process of FIG. 5, even if the voice call reception to the UE 35 occurs while the UE 35 is executing the handover process, to the UE 35 after the handover process of the UE 35 is completed Voice incoming can be notified.

  Furthermore, the MME 15 does not execute the voice incoming process according to the Paging Request message received first, but performs the calling process of the UE 35 when the Paging Request message is resent, compared with FIG. 4 in the network. The number of signals can be reduced. As a result, the flow of voice incoming processing can be simplified, and the processing load on the network can be reduced.

Embodiment 4
Subsequently, the flow of the voice incoming process according to the third embodiment of the present invention will be described with reference to FIG. In addition, in performing the process of FIG. 6, the process of FIG. 3 is already implemented and suppose that UE35 and MME15 are in an ECM-CONNECTED state. Steps S61 to S69 are the same as steps S41 to S49 in FIG.

  In FIG. 6, when the UE 35 and the SGSN 20 enter the PMM-CONNECTED state (S69) after the completion of the handover process, the MME 15 receives the Paging Request message during the handover process, the CS Paging Indication message. Are sent to the SGSN 20 (S70). In step S68, the MME 15 transmits a Forward Relocation Complete Acknowledge message to the SGSN 20, thereby determining that the UE 35 and the SGSN 20 are in the PMM-CONNECTED state (S69), and transmits a CS Paging Indication message to the SGSN 20. (S70).

  In FIG. 5, the MME 15 has sent the CS Paging Indication message to the SGSN 20 in response to the Paging Request message being sent from the MSC / VLR 45. On the other hand, this process differs from the process of FIG. 5 in that the MME 15 transmits a CS Paging Indication message to the SGSN 20 without waiting for the retransmission of the Paging Request message when the handover process is finished.

  In order to execute the processing of this figure, the voice incoming control unit 11 of the MME 15 needs to know that the Paging Request message has been received from the MSC / VLR 45 in step S64. For example, the voice incoming control unit 11 may have a Paging Request message reception flag or the like, and may set the flag to ON when the Paging Request message is received.

  As described above, by executing the flow of the voice call reception process of FIG. 6, even when the voice call reception to the UE 35 occurs while the UE 35 is executing the handover process, to the UE 35 after the handover process of the UE 35 is completed Voice incoming can be notified.

  Furthermore, since the MME 15 can transmit the CS Paging Indication message to the SGSN 20 without waiting for the retransmission of the Paging Request message, it can execute the call process of the UE 35 earlier than in FIG. 5.

Fifth Embodiment
Subsequently, the flow of the voice incoming process according to the fourth embodiment of the present invention will be described with reference to FIG. In addition, in performing the process of FIG. 7, the process of FIG. 3 is already implemented and suppose that UE35 and MME15 are in an ECM-CONNECTED state. Steps S81 to S87 are the same as steps S41 to S47 in FIG.

  In step S88, the MME 15 transmits a Forward Relocation Complete Acknowledge message as a response signal to the Forward Relocation Complete Notification message transmitted from the SGSN 20 (S88). Here, the MME 15 sets, in the Forward Relocation Complete Acknowledge message, information instructing execution of the calling process of the UE 35. That is, the MME 15 sets the information set in the CS Paging Indication message in step S36 in FIG. 4 in the Forward Relocation Complete Acknowledge message and transmits it.

  In step S88, the MME 15 sets the information to be set in the CS Paging Indication message in the Forward Relocation Complete Acknowledge message and transmits it, thereby notifying the completion of the handover process and instructing the call process of the UE 35.

  Next, with the completion of the handover process, the PMM-CONNECTED state is established between the UE 35 and the SGSN 20 (S89). Next, the SGSN 20 performs a calling process of the UE 35 based on the instruction of the calling process of the UE 35 notified in step S88 (S90).

  As described above, by executing the flow of the voice call reception process of FIG. 7, even when a voice call reception to the UE 35 occurs while the UE 35 is executing the handover process, to the UE 35 after the handover process of the UE 35 is completed, Voice incoming can be notified.

  Furthermore, the MME 15 sets, in a Forward Relocation Complete Acknowledge message notifying of the completion of the handover process, information instructing the execution of the call process of the UE 35. As a result, since it is not necessary to transmit the CS Paging Indication message transmitted in step S70 of FIG. 6, the message between the MME 15 and the SGSN 20 can be reduced. This can reduce the processing load of the network.

  Furthermore, since the number of messages can be reduced as compared with FIG. 6, the call process of the UE 35 can be executed earlier than the process in FIG.

  Subsequently, the flow of the voice incoming process to the UE 35 will be described with reference to FIG. FIG. 8 shows an operation when the notification of the voice incoming to the UE 35 is successful without the occurrence of the competition between the handover process and the voice incoming process for the purpose of contrasting with the operation example shown in FIGS. explain. In addition, in performing the process of FIG. 8, the process of FIG. 3 is already implemented and suppose that UE35 and MME15 are in an ECM-CONNECTED state.

  First, the MSC / VLR 45 receives a voice incoming message sent from the voice network (S91). Next, the MSC / VLR 45 transmits a Paging Request message to the MME 15 (S92). Here, when the Paging Request message is sent, the MSC / VLR 45 starts a retransmission timer that defines the retransmission timing of the Paging message (S93).

  Next, the MME 15 transmits a CS Service Notification message to notify the UE 35 of an incoming voice call via the eNB 70 (S94).

  UE35 which received the CS Service Notification message transmits a NAS Extended Service Request message to MME15 via eNB70 (S95).

  The MME 15 that has received the NAS Extended Service Request message transmits, to the MSC / VLR 45, a response message (Service Request message) indicating that a voice call has been received (S96). In this response message (Service Request message), the MSC / VLR 45 can also be notified that the UE 35 is in the ECM-CONNECTED state. When the voice call is accepted in the MME 15, the MSC / VLR 45 stops the timer that has been activated to retransmit the voice call incoming message (Paging Request message). By this operation, retransmission processing of the Paging Request message in the MSC / VLR 45 is stopped (S97). Thereafter, the UE 35 moves to the 3G wireless area, and the call reception operation using the 2G / 3G wireless control apparatus 80 or the MSC / VLR 45 is continued. (S98)

  Although the present invention has been described as a hardware configuration in the above embodiment, the present invention is not limited to this. The present invention can also realize the processing of the mobility management device, switch or SGSN by causing a CPU (Central Processing Unit) to execute a computer program.

  In the above-mentioned example, the program can be stored using various types of non-transitory computer readable media and supplied to a computer. Non-transitory computer readable media include tangible storage media of various types. Examples of non-transitory computer readable media are magnetic recording media (eg flexible disk, magnetic tape, hard disk drive), magneto-optical recording media (eg magneto-optical disk), CD-ROM (Read Only Memory), CD-R, CD-R / W, semiconductor memory (for example, mask ROM, PROM (Programmable ROM), EPROM (Erasable PROM), flash ROM, RAM (Random Access Memory)) are included. Also, the programs may be supplied to the computer by various types of transitory computer readable media. Examples of temporary computer readable media include electrical signals, light signals, and electromagnetic waves. The temporary computer readable medium can provide the program to the computer via a wired communication path such as electric wire and optical fiber, or a wireless communication path.

  The present invention is not limited to the above embodiment. For example, the 2G / 3G wireless control device 80 may be a 3G wireless control device, and in the MSC / VLR 45, the MSC and VLR are configured by different devices. It is possible to change suitably in the range which does not deviate from the meaning, such as.

10 mobility management device 11 voice incoming control unit 15 MME
20 SGSN
30 mobile communication device 35 UE
40 Switchboard 45 MSC / VLR
50 location registration area 60 location registration area 70 eNB
80 2G / 3G Wireless Controller

Claims (10)

A control node in a mobile communication system that executes a handover accompanied by a change of control node,
A receiver for receiving a message regarding an incoming voice call during the handover;
A control unit that continues the handover process after receiving the message;
A transmitting unit that transmits a CS (Call Switch) service notification message after the handover process.   The control node according to claim 1, wherein the CS service notification message is sent to a UE (User Equipment) for a CS service.   The control node according to claim 2, wherein the CS service notification message is transmitted to the UE via a base station.   The control node according to claim 1, wherein the message regarding the voice call is transmitted from a switching node.   The control node according to claim 4, wherein the switching node is a mobile switching center / visitor location register (MSC / VLR).   The control node according to any one of claims 1 to 5, wherein the control node is an MME (Mobility Management Entity). A communication method of a control node in a mobile communication system system which executes a handover accompanied by a change of the control node,
Receive a message regarding an incoming voice call during said handover;
Continuing the handover process after receiving the message;
A communication method for transmitting a CS (Call Switch) service notification message after the handover process. A terminal device (UE (User Equipment)) in the mobile communication system,
A control unit that performs handover from the first control node to the second control node with a change of the control node;
A terminal configured to receive a notification about a CS (Call Switch) service after the handover process when the first control node receives a message regarding an incoming voice call while the handover process is being performed.   The terminal apparatus according to claim 8, wherein the receiving unit receives the notification from a base station. A communication method of a terminal apparatus (UE (User Equipment)) in a mobile communication system,
Performing a handover handover from the first control node to the second control node with the change of the control node;
A communication method, wherein, when the first control node receives a message regarding an incoming voice call during execution of the handover process, a notification on a CS (Call Switch) service is received after the handover process.

Images